Discussion
Which option(s) correctly match(es) the structures in a bacterial cell (Column I) with their corresponding functions (Column II).
| Column I | Column II |
|---|---|
| P. Cell wall | i. Protection from osmotic stress |
| Q. Fimbriae | ii. Attachment to surfaces |
| R. Flagella | iii. Motility |
| S. Pili | iv. Transfer of genetic material |
Answer: A
The correct match is P - i; Q - ii; R - iii; S - iv.
- The cell wall, built of peptidoglycan, resists the internal turgor pressure and protects the cell from osmotic lysis.
- Fimbriae are short, numerous hair-like adhesins used for attachment to surfaces and host cells.
- Flagella are rotating filaments that provide motility.
- Pili, in particular the sex (F) pilus, bring cells together for the transfer of genetic material by conjugation.
The second option gives fimbriae motility, which they do not provide. The third and fourth swap the roles of flagella and pili or give the cell wall attachment, contradicting these standard functions.
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